Strange lights hovered low in the sky then accelerated quickly from Longmont CO to Boulder.

I feel stupid reporting this - may be nothing. i observed strange lights that appeared to be hovering in a rural part of Longmont, CO (SW outskirts) for approx. 10 minutes from the time i irst noticed it (approx. 10:25 p.m. MST). the lights were red and white and seemed to twinkle and pulsate, giving it a tumbling appearance, but remained stationary from my perspective, while driving. as my heading took me nearer the lights, it began to accelerate and head off to the south towards Boulder. it remained low in the sky (can't estimate) until i lost it in the distance. before i lost sight of it, it did appear to change direction and move to the west. i live near a small airport, so it could have been an airplane, HOWEVER i see those all of the time in the evening and none has ever prompted me to report it! then again, i could be totally nuts (i'm not).